The nova.pci.manager.PciDevTracker.claim_instance() accepted an Instance
object and called nova.objects.InstancePCIRequests.get_by_instance() to
retrieve the PCI requests for the instance. This caused a DB lookup of
the PCI requests for that instance, even though in all situations other
than for migration/resize, the instance's PCI requests were already
retrieved by the resource tracker.
This change removes that additional DB lookup during claim_instance() by
changing the instance parameter to instead be an InstancePCIRequests
object and an InstanceNUMATopology object.
Also in this patch is a change to nova.objects.PciDevice.claim() that
changes the single parameter to an instance UUID instead of an Instance
object, since nothing other than the instance's UUID was used in the
method.
Change-Id: I9ab10c3035628f083233114b47b43a9b9ecdd166
1f259e2a94